I would probably use a thin carbide blade on a 3 inch or 5 circular saw. I usually use a Makita 3 inch saw for that type of work. Makes a very thing clean cut. If you have to cut from the good side, be sure to use tape on the cut line to help avoid chipping.

Another way would be to use a down cut blade on a saber saw with some type of a straight edge to guide the saw. Use masking tape on the bottom plate of the saw to protect the surface from scratches.

: I'd really like to use a no-caulk, snap-together Sterling tub/surround unit in my bathroom, but I'd have to cut around a window. I saw the posting about using a hole saw to cut Vikrell for fixtures. I'd appreciate any recommendations about the best way to make long cuts in this material to accommodate a window. I'd also welcome suggestions regarding other types of materials/surrounds I could use, since I'd really like to keep the window. Thanks for your help.